git-gate provisioning into the running gateway was hard-wired to docker
exec/cp. Extract a backend-neutral `GatewayTransport` (exec + cp_into) so
the same provisioning logic serves both the docker gateway container and
the firecracker gateway VM (over SSH, added with the launch swap).
- `provision_git_gate` / `deprovision_git_gate` now take a transport
instead of a gateway name; `DockerGatewayTransport` wraps the existing
docker exec/cp behavior. deprovision is best-effort (catches the
transport error) — matching the prior idempotent teardown.
- both consolidated_launch callers pass `DockerGatewayTransport(name)` —
no behavior change; the firecracker swap flips only its own to SSH.
Pure refactor: docker path unchanged, gateway_provision tests updated to
construct the transport, all green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck
didericis
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